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Condensed Consolidated Balance Sheets - TNMP (Parenthetical) - $ / shares
Jun. 30, 2025
Dec. 31, 2024
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 105,378,979 92,659,335
Common stock, shares outstanding (in shares) 105,378,979 92,659,335
Texas-New Mexico Power Company    
Common stock, par value (in dollars per share) $ 10 $ 10
Common stock, shares authorized (in shares) 12,000,000 12,000,000
Common stock, shares issued (in shares) 6,358 6,358
Common stock, shares outstanding (in shares) 6,358 6,358